What measurement indicates effective corrosion control in a cathodic protection system?

The measurement that indicates effective corrosion control in a cathodic protection system is minimum potential shift. In cathodic protection, maintaining a potential that is sufficiently negative relative to a reference electrode is crucial for preventing corrosion. The primary goal is to achieve a stable condition where the potential exhibited by the protected structure remains at a level that reduces the corrosion rate to an acceptable minimum.

Monitoring potential shifts helps in adjusting the protection levels and ensuring that the cathodic protection system is functioning effectively. A minimal potential shift signifies that the cathodic protection system is adequately protecting the structure against corrosion, as significant shifts could indicate changes in the system's performance or the need for maintenance adjustments.

In this context, other measurements such as current flow, voltage levels, or anode replacement schedules do not directly measure the protective effectiveness in the same way that potential shifts do. While positive current flow indicates the system is working, it does not specify whether the corrosion rate is effectively controlled. Constant voltage levels provide insight into the stability of the power supply but are not a direct indicator of corrosion protection state. Consistent anode replacement, although essential for system longevity, does not measure effectiveness in terms of corrosion protection at any specific moment. Therefore, focusing on minimizing potential shifts is the most